Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual competição era o Campeonato Mundial antes de 2011?
 ###Tabelas: CREATE TABLE achievements (achievements_id AUTO_INCREMENT PRIMARY KEY, Year INT, Competition VARCHAR, Venue VARCHAR, Position VARCHAR, Event VARCHAR) CREATE TABLE channel_lineup (channel_lineup_id AUTO_INCREMENT PRIMARY KEY, Channel INT, Video VARCHAR, Aspect VARCHAR, PSIP Short Name VARCHAR, Programming VARCHAR) CREATE TABLE current_parks (current_parks_id AUTO_INCREMENT PRIMARY KEY, Park name VARCHAR, County or counties VARCHAR, Area in acres (ha) VARCHAR, Date founded INT, Stream(s) and / or lake(s) VARCHAR) CREATE TABLE list_of_ministers_for_the_interior (list_of_ministers_for_the_interior_id AUTO_INCREMENT PRIMARY KEY, Order VARCHAR, Minister VARCHAR, Party VARCHAR, Prime Minister VARCHAR, Title VARCHAR, Term start VARCHAR, Term end VARCHAR, Term in office VARCHAR) CREATE TABLE women's_doubles:_13_finals_13_titles (women's_doubles:_13_finals_13_titles_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR)  
SELECT Event FROM achievements WHERE Competition = world championships AND Year < 2011